Abstract This is a descriptive research that evaluates the coefficient reliability and validity of Tennessee Self Concept Scale (TSCS) instrument. The objective of this research is to proof the extent that TSCS instrument can be used to evaluate the self concept of drug rehabilitation residents. This research will determine whether its coefficient reliability value match the necessary standard. An instrument is considered as applicable for a research purpose when the reliability coefficient value fulfills the minimum standard (Mohd Majid Konting, 2004). The research is conducted in two drug rehabilitation centers, namely the Sungai Besi and Bachok Rehabilitation centers. The residents of both centers answer questionnaires from the TSCS instrument. The Sungai Besi center consists of male residents while the Bachok center consists of female residents. In summary, the value of coefficient reliability has fulfilled the minimum standard. The overall coefficient results are .855 whereby .888 for Sungai Besi Center respondents and .789 for Bachok Center respondents. As the reliability value is high it is evidence that the TSCS instrument can successfully be used in drug rehabilitation centers in Malaysia and other local researches.

Research BackgroundTennenssee Self Concept Scale (TSCS) is an applicable instrument in measuring self concept. Self concept is a portrayal of individual personality. This instrument was founded by William H. Fitts in 1965 using rational approaches. It is widely used for counseling and diagnosis purposes. In counseling, this particular instrument is able to identify eight elements that formed the basis of a person’s self concept, which are Physical, Moral and Ethics, Personal, Family, Social, Identity, Satisfaction and Behavior. This research is focusing on determining the reliability and validity of this TSCS instrument. 349

European Journal of Social Sciences – Volume 10, Number 3 (2009) Instruments are a vital element in making research evaluation and measurement. A good instrument is a factor in producing a high quality research. In a research conducted to measure the efficiency of a certain program or module and needs experiments, the instrument quality appears to be a very important determining factor. The quality level of an instrument can be discovered by conducting an analysis research on the instrument’s reliability and validity. Maznah and Kim (1984) in a survey on measurement instruments in counseling in this country found out that the most prominent problem voiced out by consumers are the lacking of measurement tools that are reliable and valid. This problem exists because most of the reliability and validity measurement tools used in Malaysia originated from other countries. Tools designed in other countries are obviously based on their culture and surroundings therefore there are visible gaps of differences if compared to ours. The reliability of a test tool proves its consistency (Tuckman 1988). A particular test or measurement tool can be considered as having high reliability if the same individual obtains the same score after answering the same test or measurement tool at different times (Sidek Mohd Noah 1990). Meanwhile, Mohd Majid Konting (1998) stated that the consistency of a measurement tool in measuring variables or construct is the definition of the concept of reliability in test and measurement...

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